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According to the Mirror, members of the Royal Family historically took their surnames from their father's titles so, as William is the Duke of Cambridge, George could use the name George Cambridge - just as William took the name Wales in school and the military thanks to his father's title, Prince of Wales.

Prince Harry also opted for the Wales surname.

But this could mean that George could also opt for Wales, therefore having the same 'surname' as his father.

Officially, Mountbatten-Windsor has been the known surname for the Queen's descendants since 1960.

That year the Queen - whose Royal family name Windsor was confirmed after her accession to the throne in 1952 - decided that all of her descendants should be distinguished from the rest of the Royal family by combining the surnames of herself and her husband.

In 1947, Prince Philip of Greece became naturalised and assumed the name of Philip Mountbatten to serve in the Royal Navy.